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112 lines
4.2 KiB
Python
112 lines
4.2 KiB
Python
5 years ago
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from __future__ import absolute_import, unicode_literals
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import logging
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import os
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from abc import ABCMeta
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from six import add_metaclass
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from virtualenv.info import fs_supports_symlink
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from virtualenv.util.path import Path
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from ..creator import Creator, CreatorMeta
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class ViaGlobalRefMeta(CreatorMeta):
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def __init__(self):
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super(ViaGlobalRefMeta, self).__init__()
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self.copy_error = None
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self.symlink_error = None
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if not fs_supports_symlink():
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self.symlink_error = "the filesystem does not supports symlink"
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@property
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def can_copy(self):
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return not self.copy_error
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@property
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def can_symlink(self):
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return not self.symlink_error
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@add_metaclass(ABCMeta)
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class ViaGlobalRefApi(Creator):
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def __init__(self, options, interpreter):
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super(ViaGlobalRefApi, self).__init__(options, interpreter)
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self.symlinks = self._should_symlink(options)
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self.enable_system_site_package = options.system_site
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@staticmethod
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def _should_symlink(options):
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# Priority of where the option is set to follow the order: CLI, env var, file, hardcoded.
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# If both set at same level prefers copy over symlink.
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copies, symlinks = getattr(options, "copies", False), getattr(options, "symlinks", False)
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copy_src, sym_src = options.get_source("copies"), options.get_source("symlinks")
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for level in ["cli", "env var", "file", "default"]:
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s_opt = symlinks if sym_src == level else None
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c_opt = copies if copy_src == level else None
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if s_opt is True and c_opt is True:
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return False
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if s_opt is True:
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return True
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if c_opt is True:
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return False
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return False # fallback to copy
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@classmethod
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def add_parser_arguments(cls, parser, interpreter, meta, app_data):
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super(ViaGlobalRefApi, cls).add_parser_arguments(parser, interpreter, meta, app_data)
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parser.add_argument(
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"--system-site-packages",
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default=False,
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action="store_true",
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dest="system_site",
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help="give the virtual environment access to the system site-packages dir",
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)
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group = parser.add_mutually_exclusive_group()
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if not meta.can_symlink and not meta.can_copy:
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raise RuntimeError("neither symlink or copy method supported")
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if meta.can_symlink:
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group.add_argument(
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"--symlinks",
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default=True,
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action="store_true",
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dest="symlinks",
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help="try to use symlinks rather than copies, when symlinks are not the default for the platform",
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)
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if meta.can_copy:
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group.add_argument(
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"--copies",
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"--always-copy",
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default=not meta.can_symlink,
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action="store_true",
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dest="copies",
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help="try to use copies rather than symlinks, even when symlinks are the default for the platform",
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)
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def create(self):
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self.install_patch()
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def install_patch(self):
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text = self.env_patch_text()
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if text:
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pth = self.purelib / "_virtualenv.pth"
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logging.debug("create virtualenv import hook file %s", pth)
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pth.write_text("import _virtualenv")
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dest_path = self.purelib / "_virtualenv.py"
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logging.debug("create %s", dest_path)
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dest_path.write_text(text)
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def env_patch_text(self):
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"""Patch the distutils package to not be derailed by its configuration files"""
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with self.app_data.ensure_extracted(Path(__file__).parent / "_virtualenv.py") as resolved_path:
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text = resolved_path.read_text()
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return text.replace('"__SCRIPT_DIR__"', repr(os.path.relpath(str(self.script_dir), str(self.purelib))))
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def _args(self):
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return super(ViaGlobalRefApi, self)._args() + [("global", self.enable_system_site_package)]
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def set_pyenv_cfg(self):
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super(ViaGlobalRefApi, self).set_pyenv_cfg()
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self.pyenv_cfg["include-system-site-packages"] = "true" if self.enable_system_site_package else "false"
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